Re: Messed up my Black Widow

I agree with Andre, I've used my ESR/ low ohms meter to find shorts in the past. They usually turn out to be ceramic caps.

 I'd be surprised if it was anything other than a bent pin or other basic problem on this case.

I'm surprised you have warm voltage regulators if the board has a dead short, id expect them to be cold or very hot.

Sent from my iPad

On 2 Jul 2012, at 07:34, Andre Huijts <a.huijts@upcmail.nl> wrote:

> A good ESR meter can be used with this method too as it sends 100 kHz through the "test path" it is much more sensitive than a regular DVM.
>
> Verstuurd vanaf mijn iPad
>
> Op 2 jul. 2012 om 05:57 heeft Rodger Boots <rlboots2@gmail.com> het volgende geschreven:
>
>> I don't think all the modal voltages in the world are going to help if power is shorter to ground.
>>
>> What works great (used to do it at work), but requires a damn good ohmmeter, is to find the most shorted point by measuring for it.
>>
>> I had a HP 34401 meter at my station. You lock it into the lowest ohm range and set it for 6-digit readings. Then enable min-max mode. Pick a starting point on the board. Meter will beep because you found a low reading. You then just walk your leads around looking for a lower reading. The last point that beeped is where the short is.
>>
>> But the frost-it-up method can be faster (I had a CO2 spayer available).
>>
>> I wonder if when he pushed the chips back in if a socket lead didn't just bend over on THE BACK SIDE of the board.
>>
>> On Jul 1, 2012 10:24 PM, "Christopher X. Candreva" <chris@westnet.com> wrote:
>> On Sun, 1 Jul 2012, Joel Rosenzweig wrote:
>>
>> > You could have an integrated circuit that has failed, causing the short.
>> > I've had failures with the TL082's (for example) that took the whole board
>> > down due to an internal short. These are very tricky to find. I don't know
>> > how to effectively troubleshoot that without removing parts one at a time
>> > (or at least lifting the Vcc leg).
>>
>> I wonder if it would be possible to do a nodal analysis ?
>>
>> For those who didn't take (or forgot) circuits 101, this involes simply
>> measuring the voltages at various points in the circuit (called nodes, hence
>> the name). I remember years ago fixing a WG color vector monitor, because
>> Atari printed nodal voltages on the schematics (probably exactly for this
>> purpose). With the help of people on this list I was able to determine where
>> my boards voltages differed from the schematic, and what was the likely
>> failure based on this.
>>
>> So the first quesion would be, do the Black Widow (Gravitar) schematics have
>> nodal voltages on them anywhere that would be usefull ?
>>
>>
>> ==========================================================
>> Chris Candreva -- chris@westnet.com -- (914) 948-3162
>> WestNet Internet Services of Westchester
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Received on Mon Jul 2 05:30:05 2012